.nav{
    position: sticky;
    top: 0;
    z-index: 999;
    
}
.plan {
        height: 15vh;
        width: 100%;
        display: flex;
        flex-wrap: wrap;
        .box {
            margin-top: 3vh;
            margin-left: 5%;
            width: 90%;
            height: 13vh;
            border-radius: 8px;
            background-image: url("../../image//beb32a44-0481-4696-b411-5e1b88937da2.png");
            .text {
                position: flex;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background-color: rgba(0, 0, 0, 0.4);
                /* 半透明黑色，实现遮罩效果 */
                display: block;
                /* 初始隐藏蒙层 */
                justify-content: center;
                align-items: center;
                z-index: 999;
                border-radius: 8px;
                h3{
                    color: white;
                    margin-left: 15px;
                }
                p{
                    color: white;
                    margin-top: 10px;
                    margin-left: 15px;
                }
                button{
                    color: white;
                    background-color: rgba(0, 0, 0, 0.5);
                    border-radius: 50px;
                    border: none;
                    width: 70px;
                    height: 25px;
                }
            }
        }
    }